in the bomb shelter craze of 1959, 200 permits were authorized in San Diego, and 60 years later, one bomb shelter has become a slight problem... it happens to be under the driveway, and it's settled a bit

Holles’s house was inhertited from her aunt, and came equipped with a 1950s-era bomb shelter dug underneath the driveway.

But Holles is worried about a more immediate issue: the cracking in her driveway.

There are several apparently severe cracks in the concrete. Holles says it seems like there are more cracks now than there were a year ago when she inherited the lot from her aunt. She thinks her driveway is about to give out, and the only real solution is to fill it with concrete

https://www.nbcsandiego.com/news/local/Woman-Worried-Driveway-Will-Collapse-Over-Underground-Bomb-Shelter-508140691.html
https://www.sandiegouniontribune.com/sdut-cold-war-fallout-big-boom-in-building-of-home-2010jun12-story.html